rename() can't guarantee "to" always exists if it didn't exist in the first place -- for example, rename("existing", "newfile"); on a read-only file system.
rename() can't guarantee "to" always exists if it didn't exist in the first
place -- for example, rename("existing", "newfile"); on a read-only file
system.

Reviewed by:	green
MFC after:	3 days

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